Really like the the look of WM34 so far. I do think it's going to be a bit too long as there's so much to pack in, but we'll probably end up with some quite big matches on the pre-show as a result of this:
Confirmed Matches
Brock Lesnar (c) vs. Roman Reigns
AJ Styles (c) vs. Shinsuke Nakamura
The Miz (c) vs. Seth Rollins vs. Finn Bálor
Randy Orton (c) vs. Bobby Roode vs. Jinder Mahal
Alexa Bliss (c) vs. Nia Jax
Charlotte Flair (c) vs. Asuka
The Bar (c) vs. Braun Strowman & TBA
Cedric Alexander vs. Mustafa Ali
Kurt Angle & Ronda Rousey vs. HHH & Stephanie McMahon
Women's Battle Royal - Sasha Banks, Becky Lynch, Liv Morgan, Naomi, Natalya, Ruby Riott, more TBA
André the Giant Battle Royal - Dash Wilder, Scott Dawson, Baron Corbin, Mojo Rawley, Tye Dellinger, Titus O'Neil, Apollo Crews
Expected Matches
The Undertaker vs. John Cena
Daniel Bryan & Shane McMahon vs. Kevin Owens & Sami Zayn
The Usos (c) vs. The New Day vs. The Bludgeon Brothers
Women's Battle Royal will probably include every other female wrestler on the roster, so: Bayley, Dana Brooke, Mandy Rose, Sonya Deville, Lana and maybe Mickie James, Carmella and the Bellas. Mickie could be left out to be in Alexa's corner, while Carmella may be left out for a cash-in. Tamina is injured. The rest of the numbers will be made up from NXT stars and maybe the odd Hall of Fame star.
Men's Battle Royal has a lot more to name, but the 'bigger' names that may just have to deal with being in this match rather than having a bit more of a spotlight are likely to be: Bray Wyatt, Matt & Jeff Hardy (I can't see that story going any further now), Dolph Ziggler & Rusev (unless they sneaks into the US Title picture). There's also Kane & Elias, the latter I think is almost nailed on to be Braun's tag team partner. Kane would also make sense, but due to the election he can't commit to full-time work in the WWE. It'd be a bit flat to retire without doing something at this event, so maybe he'll be in this match and win it, or be the last to be eliminated to put someone over again.
So, 14 matches guaranteed to happen IMO. At least three will be on the pre-show - the Cruiserweight Title Match and the Battle Royals. It's a bit hard to demote any of those other matches to pre-show, so maybe they'll be another smaller level match added to it. Could be something involving Bray and Hardy, but that Ultimate Deletion thing on Raw seemed like a good closer.