I have uploaded some LR4 presets here https://dl.dropbox.com/u/4616543/Lightroom%20Presets%20LR4.zip Below are examples of them added to a photo I took of Jack this evening.
SOOC (Straight out of camera)
Colour Pop – preset added
Colour pop with vignette added
Black & White with vignette added
I hope they are of some use.. Comments welcome..