Actually, I think Gordon has just released Hotpot for M2, but there are some issues not yet clear (both as to HotPot and other non-core mods on upgrade to M2.)
While it is apparent that upgrading to Moodle 2 fails when non-core mods are installed (is there something in the upgrade docs that addresses this yet?) users are advised to "remove" non-core mods, but users are not told specifically what steps to take to accomplish this.... Do they have to just turn off the mods in the admin GUI? Do they have to delete the mods from the admin GUI?, do they also have to physically remove the mods from the file system?
While I had posted some time ago about issues with M2 previews crashing on mods, that issue has been now closed without any explanation as to how M2 now avoids the problem, and as many people have complained that this is still apparently the behavior they see in M2, I'd have to argue that anyone with a Moodle 1.9 has a significant chance of losing everything by upgrading to Moodle 2 without have a detailed picture of why M2 is crashing on upgrade and a clear and concise recitation of the actual steps one must take to possibly avoid any disaster.....