The new cart is stable and live, though we're still finessing a few minor usability concerns like the Continue Shopping button you mentioned, so we haven't made it the default for all new account registrations quite yet.

The yellow alert bar at the top of our Admin panel has shown a new cart notification for some time now, linking to this thread with instructions to opt-in for trying out the new cart. We won't switch any existing clients to the new cart automatically, as we have no way of knowing who may have customized the classic cart on their site, so existing users of the classic cart would need to deliberately opt-in for the new cart if they prefer. Eventually there will be a preference setting for this in Seller Admin.

Our cart demos show how our cart and checkout pages appear. This one for PayPal Payments Pro offers buyers a choice of paying with PayPal or a card; if you add an item to the cart, choose the card option for payment, and click Proceed to Pay, you'll see our checkout screen for card payments (we provide dummy card info you can use to test a payment here):

If you'll be using a different payment service, you can select that in the green menu near the top of the page and test the checkout experience for that. At present, our 2Checkout integration redirects to a page on 2CO's site for final entry of card details, and PayPal Payments Standard presents the card payment option (if you will accept it) on PayPal's checkout site, but all the others use pretty much the same card checkout screen embedded in our shopping cart.

I will have to inquire with Development about that, will followup here once I know more.

A recent update to our new cart seems to have broken its GA integration. It's not clear how long it may take Dev to resolve this issue, so if GA/Ecommerce Tracking is critical to you, we would recommend switching back to our classic cart until the issue is fixed in our new cart. I have confirmed the classic cart does still support this tracking integration as expected. You can use this link to switch between carts:
https://www.e-junkie.com/ej/insider/5

Our new cart and new thank-you page when used together should now support GA integration -- see details here:

We now have a consolidated page where you may opt-in/-out for any of our beta updates currently open for testing. Once you log into our Admin panel, you can access your beta preferences here: https://www.e-junkie.com/ej/beta_features.php4

The new share icon (and SMS/WhatsApp icons on mobile devices) at the top of our new cart will allow a visitor to share the item(s) and any discount(s) in their cart with someone else, who could then access that shared link to start an identical order -- e.g., a buyer could put together an order of items they recommend and share that with a friend, or a seller could put together a combo deal and share it on social media to let buyers purchase it instantly.

Unfortunately, due to technical limitations this can only bring up the shared cart as a freestanding page; it's not possible to have it bring up a sales page on the seller's site and add the shared items to a cart there.

A recent update to our new cart appears to have introduced a problem with Internet Explorer. Fortunately, IE accounts for only about 3% of Web users these days, but if a significant number of your buyers happen to use IE, you can simply disable the new cart for your account here, once you're signed into Seller Admin: https://www.e-junkie.com/ej/beta_features.php4

We will post a followup here once the issue with IE is resolved.

Our new shopping cart layout will now be used for all instances of our "fallback" cart that appears in a separate browser window/tab whenever the overlay-style cart cannot work for any reason (e.g., missing/garbled View Cart code, Javascript disabled in the buyer's browser, etc.), regardless of which cart version the seller has enabled for their account. Our standard overlay-style cart will still always correspond to the seller's cart-version preference.

One more update: whenever our overlay-style cart appears in a page with a regular http:// (non-secured) URL, the card checkout button in our cart will now redirect to secure checkout as a separate page, so buyers will have no question that their payment details are handled securely.

The card checkout button in our classic cart will now also bring up this new-style card checkout page.

In order to retain a card checkout embedded within our cart overlay in your sales page, you would need to enable secure-encrypted https:// URLs for your sales page(s) if not your entire site.

Eventually we plan to support an Admin setting to customize the new cart's highlight color (currently golden-yellow) and perhaps select an inverse (light on dark) color scheme.

We'd discussed showing your uploaded custom logo/header image or else Display Name when the cart appears in a separate window/tab, not sure what became of that, so have asked Dev about it now.

Aside from that, the new cart will probably never be as customizable as our classic cart; this was a necessary tradeoff to ensure the new cart would look good on as many sites as possible. The classic cart had started looking wonky in an increasing number of sites themed with heavy-handed CSS, so we changed how we embed the new cart overlay to a method that can't be affected by the site's own CSS.