High CEP, consistently high performance grades (regularly getting Bs, occasional A), and still young enough (exact cutoff not known). FLP is centrally managed by HR, so all you can do is wait for the news.

6 years in service and still GEO3 may not suggest a very high CEP though, so you will need to temper your expectations a little. I'm not saying you're definitely not going to be on FLP, but you need to realise that at least amongst the young "go-getters" in the service, it is very competitive.