This September, Really? Cool!
And please work on RTL+i18n a little more to make that release out of the box ;)
I'm not a programmer but I can test this application in order to report bugs related to RTLing!
Currently, RTL isn't supported properly. It just changes the direction of texts, while it should swap position of some elements from left side of the page to the right side.
A reason that forced me to abandon Shopify.com is GATWAYs! In many countries, there are native payment gateways (working with Bank's URL, an ID, a username and password given by the bank). When you buy sth, instead of Paypal, The system sends you to the bank website for payment and the bank service will return you to the shop after a successful transaction. Paypal or international credit cards such as Visa aren't popular in some zones! People prefer to work with native bank systems.
Another question, Will you add a commenting system under products?
And, Won't you run a forum for Reaction? It will be easier to communicate within a forum when the app is growing up, I mean something running by discourse.org, vanillaforums.org. nodebb.org, even telesc.pe!