I posted about this earlier today in the Moon+ syncing thread. I have Moon+ installed on my Galaxy Note 10.1 and saw the new syncing features and decided that I would install on all of my devices. Went to the play store last night and I couldn't find it. The only app you can find is Moon+PDF reader plug in. I double checked on my Note 10.1 and under all apps, it's missing. Amazon has the pro for $4.69. I also emailed the developer and have received nothing so far. I considered buying the app last night before I noticed it missing, but not now. That's a little too much money for something that might disappear altogether.
Very strange indeed.