Folders comes as part of 8.1 Update, and is independent of Denim.
Anyone in the Developer Preview program has access to folders now, and nearly all of them are on Cyan. It is also...
Another instance of the fix posted by marter and rmonroe36 working here... mine finally installed properly after uninstalling the other updates.
Finally a Dropbox software update that isn't just to fix a bug or security hole.
Yes. Bluetooth can be turned on and off at will. It also has a separate airplane mode which also disables Bluetooth.
I think a lot of it comes down to the size of your monitor. If Those who have something relatively large... say 22" or or so, do open multiple apps at the same time because they can without...