Well it works smoothly from the CM point of view for special events.
We give HTC an AH1 one map that uses no custom tiles or objects. HTC takes it and converts it and posts it to the SEA.
Downside is that we don't have the custom tiles that were created for previous maps (winter land scapes, deserts, etc.) and not the custom field layouts and objects (like in the slot and BoB map).
But it gets us up and going again for holding events. Then when the TE comes out the CM terrain team then goes back and starts to customize the AH2 maps with custom objects, fields layouts, and tiles down the road.
So its a stop gag for us while waiting for the TE and allows us to keep events going in the mean time.
Extra work for HTC but I don't think the TE will be long in coming. My guess would be maybe a month or two .. just a guess no specific info that the CM teams knows. Just my opinion.