Hi Joel - great to hear!!
Actually, 4.2 is almost ready for Apple - it was officially code-complete yesterday. Today starts my formal testing period. I keep looking out of the window - FedEx should be arriving today with my thermocouple mini-connecters and some other goodies so I can hook my live probes to the Bluetherm Duo and start roasting. So far, I've been testing it with a spare probe, so I'm anxious to use it in live roasts.
As it stands now, the next update will include support for the Bluetherm Duo, and the wired iCelsius BBQ. That, though, could change quickly once I start testing. If I were to find any problems with the SDK of either one, I'll have to pull it until the manufacturer can fix the SDK, but I've been testing both steadily over the past month, so I'm hopeful things will be fine.
AFAIK, the wireless iCelsius is still in pre-order stage at the moment, but I plan to add support once that becomes available. I'm anxious to get ahold of one, though - the iCelsius SDK seems to be top-notch, so I'm sure it will perform well.
As far as timeframe, it's tough to say with the iPhone event today. I want to test with iOS 7 before releasing, and we as of yet do not have the gold master build. Hoping for that in a couple of days. If you'd like to beta the next version, feel free to send me your UDID. Otherwise, I'm hoping to submit in a couple of weeks as long as I don't find any issues in testing.
Thanks Joel