There is a lot of talk, and a lot of community involvement with tiles, but it really did go as planned, in that GalenEvil did the vast majority of the work on tiles support, and other than some bugfixes and restructurings here and there, it didn’t take time away from other development.
Regarding roaming mobs, there are several technical issues standing in the way of it, and it’s been putting people off. There’s no ETA on it, but the way things work in this project, it can go from “nobody working on it” to “it’s working” in just a day or two.
For my part I’ve been focusing on bugs for the last week or so because the number of them does seem to have gotten a bit out of control, little things like crafting eating containers, vehicle turrets not working, and smoker smoke spreading through walls.