Is there a way to make use of tilemaps yet?
Seriously, that was the one feature Game Maker had that made it appealing. RPG Maker was obviously the easiest program to use tilemaps, though, so I'd take note of RPG Maker if you plan to add such a feature.
Basically, what a tilemap is is a large image of tiles. Some people call them tilesets. Anyway, you can use tilemaps to build levels for platform-jumping games and traditional RPGs. Beyond that, tiles don't seem to help, but who knows, someone could find a use for 'em!
Last I checked (last year), Construct didn't have a tilemap feature, and I don't think it had a snap-to-other-objects feature, either, so building a tile-based stage was probably a little difficult. I do remember you could create backgrounds with a repeated tile, but how is that useful for anything other than a single-tile ground?