On Sunday, HT said he was the hold up on the new skins. He felt there was enough to be tested right now and he didn't want to choke the system with a bunch of skins to be downloaded.
My guess, uninformed with no proof to back it up, is that any new skins that will be released will be put in with the final patch/release for AH2 when it goes live. The other option is to rekease a few each day or couple of days to ease server load.