Flash is still a lot of fun and this issue was loaded with the kind of stuff I like, and great art.
The Barry and Hal team-up was still a lot of fun, and I liked Williamson's handle on Hal Jordan. I also liked his long game approach where Multiplex (still feeling his beatdown at the hands of Midnighter, natch) ends up in the hands of Black Hole. They're proving to be a rad concept, and bringing Multiplex into the fold is cool.
The big thing though was naturally Thawne. His characterization here; where because he has skipped and survived reboots and retcons and timeline shifts and so he's looking at the current status quo with the same skepticism as us fans, was really nice. He proves to be an effective villain for that meta-commentary, for his viciousness, and I like the notion that to try to get his timeline curiosity "grounded" he's actually dooming himself to repeat his past mistakes, like trying to drag Iris to the future and re-kill her is a way of setting things right somehow. Also, his dialogue to Iris felt like direct throwback to some of the weird timeline quirks that resulted from Final Crisis (Barry and Iris's return), Blackest Night (his own resurrection), and Flash Rebirth (His timeline alterations). If you're Flash's mortal enemy from the future, yeah, I can see how all these timeline shenanigans would really start pissing you off. STOP CHANGING MY PAST!
The other big thing for him, and it's kind of huge, is his interrogation of Wally West - as he voiced fan outrage by claiming that the New Wally is a direct result of timeline tampering and isn't even a real character. That ties in well too with his jealousy or hatred of Daniel West for stealing his gimmick, no doubt. But more than that, when he asked "What kind of Kid Flash are you?" he directly highlighted the word Impulsive and referred to Kid Flashing as "living in Flash's shadow", which felt to me like direct, overt references to Bart Allen (well, and Classic Wally as well, of course).
Thawne's position as a resurrected speedster from the future who is immune to some timeline Flashpointing effects means he's one of the characters most aware of all the meta nonsense that's been happening to continuity all around, which is a neat role to have, because he can drop some great hints, clues and exposition. Jay Garrick is out there ... can Bart be far behind?
Lastly ... well, I'm just still not sure how the heck he could get murdered by Doctor Manhattan two issues ago and still be running around. Very curious about the specifics to how that crazy stuff works! But it's obvious it all ties right in to Flashpoint, Button, Doomsday Clock, and probably Oz, too, if that's where Bart is locked.