There is a
heated bar tape set up available now, I have seen ads for them in the various magazines this fall. The mfgr also makes a set up for motorcycles that is pretty well thought of and is reliable. The name is Ame, here is a link:
http://www.amegrips.com/ the bicycle tape is down the list on the left. This coupled with a thin, wind proof glove should be pretty warm.
Bill