I'm having the same problem (incorrect order preview) with the revision 350 bzr checkout:

Order total preview:
UPS Ground Rate: $8.81
State Sales Tax: $14.00
Order total: $22.81

Shipping and sales tax show up fine, but there's no order subtotal. I don't see any set_line_item('subtotal' on the page source - only set_line_item("shipping", label, rate, 1);

I'm also having a problem using Views with Ubercart products now too. The price column is showing up as $0.00 for every product. Seem like it could be related...though I'm not sure how...

Hope that helps! Let me know if I can provide more useful info for debugging...

Thanks,
Xerxes