Trending @Capgemini; Will I get any hike for needs improvement rating? Btw when can we expect hike details?

Does this company as to retain and if yes any idea how much we can ask for it

No there won't be any hike. You will be put on BOTP plan for 2 months. If you successfully complete all your assignments and your manager confirms you are good, you will stay in the company. Else they will ask you to leave.