Apart from that I'm quite happy with 1.5 (although it aint much faster)
Huffy requires a codec too, as does any video format that windows have default codecs for, if you search huffy on the web you should fine them, I think they are also part of the K-Lite codec pack.
That said, even though I have huffy codecs, and windows media player will play back the huffy vids MS produces, when i try to import them into vegas the video imports fine but the audio appears as just a short blip, so i am left still having to extract the audio from the huffy file using AoA audio extractor, and then import the audio seperatly into vegas.
This is the exact same issue I have with the default MS Avi render from versions previous to 1.5, and which is still available with 1.5 as a legacy render.
So for me I guess i will stick with what I always did, render out as the old MS default AVI, and extract the audio from it.
I have installe the codecs for Webm and my windows media player will now play webm files perfectly, but neither Vegas or even windows own built in movie editor will even recognise Webm as a video file.
I guess, and hope, its just early days for Webm atm and support for it will slowly grow due to google owning it