"Russian Roulette" and 1 week notice?
@Michael C, de facto this happens. Go to xdadevelopers.com, or one of plenty of other sites, and there are ROMs for your phone that incorporate newer versions of Android, fixes people have collected up, and so on. But as K. Adams alludes to, some people would not handle this well.
We used to have problems with return attempts at the surplus store I worked at -- we had normal (used but functioning) computers for down as low as $50, and scrap machines for $5-$10 -- they had an arrow saying "parts machines, as-is", people would specifically ask and I'd point out they don't run, they might need RAM or the like and quite a few have blown capacitors (but they could pop the lid and look, and I'd even point out the blown caps for them). Most people who bought them replaced the caps etc. and were happy, they'd get like 90% to run and resell them and use the rest for spare parts (these were mainly piles of Dell Optiplex GX270s so everything was interchangeable). Every so often, someone would keep asking about them like 3, 4, 5 times (not different days, like 5 times in a row), like if they phrased it right the answer would change to "oh they actually work fine" and every time I"d point out they don't run and are not returnable -- they'd buy one or two -- then come back to return them and be all shocked when I'd point out they are as-is, I told them they are as-is, and there's a giant sign saying they are as-is so no I won't accept a return. (We had to be firm on this, otherwise we had customers playing a sort of "Russian Roulette" with caps, they would want to buy and return $10 machines until they got one that worked (a few had a blown cap on an AGP slot or something that didn't affect how the system ran) and a few resellers tried to strip the machines they bought but couldn't repair and try to return basically empty cases.) It'd be just that much worse for phones if a company prereleased updates, they could stress a dozen times that they may cause problems, and some people would just hear "I get features first!!" and not accept it when problems happen.
One week notice on Google Apps? Pray tell, what happens if the IT manager tests a new version and it breaks a bunch of stuff for him? Does he actually have an option to tell Google he's having problems, and to not update his companies instances of the Google Apps?