Who is replacing Tony Stark as Iron Man?

Who is replacing Tony Stark as Iron Man?

Ironheart But what matters here is that Marvel confirmed the Ironheart project late last year. It'll be a Disney Plus TV show starring Thorne. That's the best sign that Ironheart is the MCU's main Iron Man replacement for the time being.

Can Thanos lift Mjolnir?

As of yet, Thanos is unable to lift Mjolnir because the Hammer would certainly not consider him to be worthy. Still, Thor's recent nightmare suggested that it might happen in the future, so we'll have to wait and see whether Thanos will lift Mjolnir or not.