Yeah I mean, the majority of the hardware stuff has been taken care of. We've got support for both regular and thermocouple probes, we've got WiFi, and we've got servo+fan output capabilities. What else could you add, hardware-wise? Maybe a color/LCD screen at best, and most folks won't care for it. I think if there were ever a future hardware need, it would be for something like support for 2+ cookers at once, etc.
The software is where all the magic happens. I'd expect to see 2 things happen over the coming years:
1. Adaptation to other rPi devices and other microcomputers
2. Improvements to software performance and features.
What else could you need?
WELL worded, young Nick (by the way,how did Memphis go?). If you look at other options for smoker controllers, I think the HM is a bit hard to beat, both in price and features. No other controller has fan and/or damper control, no other controller has "built in" graphing, no other controller has user settable PID (as far as I know), and, most important, NO controller has more user support than the heatermeter. Plus, if your savvy enough (I'm not), you can re-write to code to suit!
There will be new versions developed as time progresses, but I agree with NickMV in that the current version is the most stable version developed thus far. It has most/all of the features that any BBQ enthusiast, be it beginner or professional, could want. Sure, it can't control multiple smokers like the "Stoker", but ALL of the parts for the HM are readily available, and you will never find yourself having to pay $65 for a proprietory part with the HM.
There are a few key names you need to follow here on the forum. Of course, Cap'n Bry (Brian Mayland), Steve_M is a genius on the electronics aspect and is a regular answer, SteveCK has some great ideas and damper designs, DavidNP has some alternative options that will blow your mind. and RalphTrimble always amazes us with both his designs and input into the forum.
Take the heatermeter project for what it is. An AWESOME open source project that develops ideas over days, not years.
Should you wait? Hell No! Build it, and the BBQ sniffers will come.