I don't think I saw anyone mention this as causing an issue, but I was having severe battery drain from the last build before this minor update (although not experiencing any issue with .29 on my 1020). However, I spent several days trying to find the battery drain and finally realized there was something always connecting to my cellular data connection (if I turned off my data connection my drain would go away). I hated not having it on so I tried one by one eliminating stuff that I could think of causing it.
Finally stumbled onto the Messaging + Skype app, more specifically the Skype portion of it. I tried disabling Skype and my battery drain improved drastically, i.e. no longer 80% battery gone from waking up to about an hour into work (6am - 9am) but more along the lines of 10%. I haven't really monitored too closely since disabling Skype and being much happier with my battery life. I will start monitoring again, but disabling Skype in messaging worked like a charm for me.