What did I hear about Honda, I think it was something like if the rules change in F1, Honda may get back in...Turbo being the key issue with Honda, they want turbo. Not 100% on this, but if true it would be hell-a fun to watch!
First thing - it is reported in The Sun!!!
Second thing - With the regs change in 2014 most engine suppliers will be in the latter part of their R+D, so we would have heard about it by now if they were.
Third and most inportant - Honda think that the UK market is for all the oldies, so this tech prob wont see a UK road unless its imported.