NT scholar M. Eugene Boring (Brite Divinity School) has written a NT Introduction (coming Oct 2012, WJK). He is well-known for work on the Gospel of Mark and Revelation. Apparently it will be a hefty volume (700+ pages). I am still on the lookout for a good introductory textbook so — fingers crossed!
I love Currents in Biblical Research and the new 10.3 issue has a couple of interesting articles, one on the reception of the Gospel of John in the second century. Check it out.