Nextbrew is a weak aura made by Azrial on Ragnaros (EU) at my (Bastian's) request. There is no in-game obvious way to track the amount of Chi you need to spend until you are awarded your next Tiger-Eye Brew stack, so this is the devised solution. Alot of high end windwalkers usually keep a mental note of this number, at least on the opener since it can affect your decisions of when to consume your stacks of Tiger-Eye Brew.
Unfortunately there is a bug in game where you are simply not awarded Tiger-Eye Brew and as a result this aura will lose track of the correct number due to the games fault. Casting Tiger Palm x 4 will re-sync the number, or alternatively relogging will too.
Don't rename the aura as the Saved Variable function it uses will stop the aura from working, and do not have two of the aura loaded simultaneously. This is intended for PvE use and as a result will likely not function well in PvP, if at all, reliably.
I have asked Pandanaconda to post this because my own account doesn't have enough posts to post links, and since he is an active member of the community here you are more likely to believe it is an asset to your DPS.