I'm currently on Tier 2 General. Two months ago the company I work for (company A) got acquired by company B. Company B is a bigger company but they don't currently hold a sponsorship licence. Company B plans to move most employees from company A.
They have notified the HO of the merger and I was told they applied for a license. They were advised that the process will take up to 18 weeks. In the meantime, they just sent me a new contract (for company B) and would like me to sign it asap. The role is the same (other terms too, expect for the actual company!).
I am not sure if I should sign it before hearing back from the HO? As far as I am concerned, my original company A still exists (and will be at least for the next few months) and I am worried that by signing a new contract I am breaking the terms of my current visa, by technically working for a different company

Is it safe for me to sign the new contract?
Thanks in advance!