We don't know what the third stage will be yet do we for this latest approach to bans?
First bans were 6 months in May 2015 (we lost 2 guild members to this)
Second bans were 6 months if first time, 18 months if second time in November 2015 (the same 2 who came back promising they had stopped botting got banned again for 18 months this time)
None of those who were hit with 2nd offence bans could be caught up this time so its just those caught for a first or second time again.
Presumably we're going to be waiting until May/June 2017 to see what stage 3 is.
Although mentioning the two guys in my guild who got banned, we just edited their notes to highlight their expected return date from the "break" they decided to take both on the same night at the exact same time when they both also came back at the same time.