NXt could have Bobby Roode, Roderic Strong, eric young, Moose and a few others before the summer is out . Aerican alpha is rumored as well as bayley to be calle dup soon.
Lots of changes going on with the brand split.
so far it looks like
Raw
Reigns and Rollins
Smackdown
Styles and Cena
Tag Team Anderson and Gallows
rumours also suggest that Ic title will be on one show and US title will be on another.
I suspect if Orton Joins the Cena /wStyles feud that he will be going to smackdown as well
lets put guys in categories
Special Event
Brock Lesnar, The Rock, Triple HHH etc
Main eventers
Rollins, reigns, Owens, Ambrose, Jericho, Cena, Styles, New Day, Bray Wyatt, Randy Orton
2nd tier Main eventers
Rusev, Sheamus, Albert del Rio, Dolph Ziggler, Sami zayn, Cesaro, The Club
Mid card
Miz, Big Show, Kane, Dudley boyz, Usos, Lucha dragons, Titus O neil, Darren Young, Neville
Jobbers
GoldDust, R Truth, Fandango, Tyler Breeze, Bo Dallas, Heath Slater, Zack Ryder, The Ascension,
New Era ( Undetermined)
Vaudevillians, Enzo and Cass, Baron Corbin, Apollo Crews , Finn Balor (soon) American Alpha (Soon)
that's around a 40 man roster for the mens and tag team devisions.. 38 if you count the golden truth as a tag team.
Tag teams
New Day-The Club-The Wyatt Family-Usos-VaudeVillians-Sawft-Dudley Boys-Lucha Dragons-Golden Truth-Fandango and Breeze-Social Outcast.
I would imagine they would want at least 20 individual wrestlers for each show and 6-8 legit tags teams for each brand.
NXT on the other hand are bringing in more guys like Samoa Joe who has his own merchandising and following and were prefer that arrangement than a WWE contact. Roode, Strong, and Mosse and the other guys if they get them will give the NXT a stable of guys who can work with the young talent