I believe I remember reading that Disney was not planning to CGI Leia into the next movie but nothing more has been said about it as far as I know. A look-alike is one option though whatever they decide I think Leia's role in the next movie will be small.

It's possible, though probably unlikely, that there's unused footage from the last two movies that they could use but this is probably a bit of a stretch.

I guess we will find out in 22 months.

Maybe they'll do for Princess Leia as they did for Bella Legosi in "Planet 9 From Outer Space". Have a near look-alike actress walk through the scene with a cape draped over an arm...and covering her face.

Same as Luke become one with the force.

No longer star wars fan... I moved on.