I would at least wait a few more weeks for the next patch. then check these forums to see how it is performing in terms of both stability and AI. If the reviews are generally good, give it a go.

given the info coming out of CA it is possible that Napoleon will be completely separate from ETW. In addition, given their stated plans to continue to support ETW and add downloadable content I am not sure it will be discounted quickly. A bundle will probably not come out until at least 6 months after NTW launches.