Several new chassis from Tsugawa (the folks who make the tiny chassis I use in the 48DS).
TU-KIHA40000 is a tram chassis about 8.5cm long with two motor bogies in it and short tram like bogies.
TU-TMC100 is a 12ft wheelbase four wheel chassis with a very low profile that seems to have been designed by them specially to power my 'Flying Matchbox' and I've just ordered one to replace my scratchbuilt effort which isn't working too well.
Bandai have also released a few chassis of late including a rather handy #3 bogie chassis aimed at their B-Train shorty stuff. It's just about going to work for my District Line loco :claphappy: plus a slightly larger one (#4) and some equivalents to the Kato mini ones.