Interesting to see a frosted version, appearance wise they remind me of some of the earlier low wattage LED candles!

Probably more suited for cap down use!

Yes, I would imagine so!

Definitely, I could see the electronic transformer failing before the capsule if burned base up, I expect the heat issue would be even worse than CFL with these.

Not necessarily. Most of the heat from halogens is IR, the gear just hve to be covered with something reflective to reflect the incident IR awy from it and out of the lamp. The remaining conducted heat would then be (i assume) somewhere on par with todays heatsink-less LED lamps. But then, considering that the "transformer" here is likely nothing but a dimmer circuit pinned to one specific setting, it doesn't have much in the way of thermally senstive components. The SCRs have max junction temp around 150C typically and likely are pushed to the limit