Honestly it hasn't really changed all that much. Mostly over the last couple of years it's been incorporating new pieces into existing ideas. Biggest change was probably the new su3 set allowing us to build enmity sets which are amazing for establishing and regaining lost hate though wouldn't necessary idle in the them. Then before that was upgrading SoA and a couple of potential idle pieces from omen. Kind of sad went from getting a pupdate every 2-3 months to well a bunch of non updates for everyone lol
Haha, yeah... Though at least PUP got some excitement somewhat recently with the supposed "Monk update" in August (disappointing for MNKs, but ended up being pure win for PUP with the significant H2H weapon DMG increases). Not that it changed anything with respect to tanking though...
For tanking, I think the only real relevant changes in the past year or so have been:
* Su3 Heyoka set for enmity purposes (this is actually REALLY nice for quickly swapping into before Voke/Flash, establishing initial hate, and regaining hate after a reset or calling out a new puppet)
* From Omen, Enmerkar Earring is a pretty great piece
* AF+2/+3 legs and Tali'ah Seraweels/+1 are potentially useful for tanking, though I don't personally ever see a major need for them and I still prefer older gear in that slot. At least they are viable options though.
As Sirris linked above, I actually wrote up a current tanking mini-guide just earlier this month (glad it seems to have been somewhat helpful to some people!). Aside from the few points listed above though, there's not much that would be new news to anyone who was already familiar with PUP tanking in the Reisenjima era or later.