Yes, I have asked Kobo a few times about other smartphones. I'm willing to buy the next Kobo/BT compatible touch phone offered through Rogers but no answer from Kobo if, what, when on the next compatible smartphone.
I live in Canada and we were the "test subjects" - my initial query to Kobo was beginning of April. I should have been advised, "Initially, only Blackberry models #### will be BT compatible. We hope to make the feature available on other phones within xxxx timeline."
You are absolutely right about Apple's severe restrictions so Kobo probably won't be able to offer the BT sync feature on an iphone. I won't be purchasing another iPhone (though mine is jailbroken and does have limited BT file transfer capability). Blackberry BT/Kobo users report excellent results, so the feature is a positive one.
The best reviews on a product come from end users and the more contributions from those end users, the better.