Sticking lights on gloves isn't a *bad* idea. It's the next logical step from retroreflectives, which demonstrably work well to make hand signals visible at night (the only time it's really an issue, I reckon, and more so for people with dark skin/clothing). The trick is going to be making it durable enough that it'll survive any reasonable glove-cleaning regime. I find even retroreflectives have a hard time of that. If they can manage that and keep the faff/cost down, then they could have a marketable product. As long as it didn't tie you into a pair of tesco value mitts.
Indicators on the bike, while sometimes a good idea (velomobiles, cargo bikes, riders with hand disabilities, that sort of thing), are always going to be niche. And most of those niches are ones where hacking together something with motorbike parts and 555 timer chips is a perfectly reasonable approach - a one-size-fits-none commercial product isn't actually going to be that useful.
Stop lights are a different badger. I molished one on a bored Sunday afternoon to test some microcontroller development kit, and it's still on the bike and functional. It's entirely possible to make one that's fit-and-forget and actually works (especially if there's a dynamo hub to act as a combined power source and deceleration sensor). Indeed, B&M have a commercial product integrated into some of their rear lights.
Whether it's actually useful, I'm not sure. I've had positive comments on group rides. I suspect it would be more useful on a velomobile, cargo bike or recumbent - especially with above-seat steering - where you don't get much in the way of body language when viewed from behind to suggest that the rider's about to slow down. Of course, recumbents have WTF-factor to protect them from motor traffic anyway, so that'd mostly be useful for group rides with people who aren't used to 'bents stopping suddenly. Again, rather niche.
At the end of the day, it's a classic technology student project: a problem for which a solution is simple, elegant and wrong.
