Next Ultra is cell and theres undeniable evidence that say so

With the lauch of LF zamasu its not likely we are getting a UL fused Zamasu and other expected ULTRAs dont seem to have evidence to if they are the next lauch...except for perfection itself Mr.Perfect Cell.

Lets start with unit lauches we hade:

Super Gohan and Trunks(Youth) Rev into Super Trunks

Fusion Zamasu

With tags are presents here Future,Regen and powerful opponent all tags Cell has.

Zenkai: The zenkai we got until now are non other than Mr.Perfect cell himself

Free to play unit: We got a free to play piccolo from the cell saga plus piccolo has the Regen tag

ULTRAs returning: The ULTRAs returning are UL Golden Frieza and UL Rathan, powerful opponent and Cell saga

Theres a lot of evidence suggesting its Cell but we still have to wait and see for Mr.Cell's lauch.