April would be remarkably optimistic for the US Carriers. I'd say the October to December time frame would be more likely. Samsung has to do their modifications to 5.1, then test it then send it to the carriers to modify and test and go back and forth a few times to iron down any bugs. To get an update to the OTA stage a month after it's public launch is a bit unheard of, outside of Nexus. Plus I bet they are waiting to see what bugs pop up in the release software that they could fix in 5.1 to avoid trying to push multiple small updates though carrier certification.
Sprint and T-Mobile should be fast, relatively speaking, with Verizon and AT&T taking up the rear. AT&T has been pretty abysmal with updates lately though.
Carriers are a bit slow which is why I hope they get better as there has been more of a clamor for faster updates. 5.1 will have been out for over a month at go live date which should give Samsung and the carriers to add their touches.
No Android 5.1 builds are under development for the Galaxy Note 4 or any other Samsung device
There seems to be some disagreement about the report :/. It's not surprising to me that Samsung hasn't started on 5.1 yet; waiting until the S6 is out for a bit and they can start seeing whatever bugs have cropped up with that release so they can fix it in a 5.1 update makes sense. Plus Google has not had the best track record with 5.0 updates, 5.1.1 might be right around the corner for all we know.
Maybe a newb question, but the article references Samsung creating 5.1. Wouldn't Google be doing this?
Posted via My Samsung Galaxy S4 Handheld Device