I would assume that they wouldn’t be limited to strictly running HTML5 apps… There must be a SDK for native apps – looks like a QML based API.
If they can attract some skilled developers, there should be some great stuff… The old Linux-based Nokia phones/MIDs had some wonderful enlightenment/python-based apps – looked better and had better function than most of the dreck I see on Android/iPhone. There were open streetmap programs/etc and some GPS programs that had become at least as useful as Apple’s offering. Since they were linux-based, it didn’t take much effort for developers (even tinker-level programmers) to port Linux programs to the devices.