Hi,
If you are a front-end guy, nothing need to worry on the Technology migration part (Same RTL Design and Verification Environment can be used).
Sometime frequency also will be same. (Most of the time with the Technology migration performance improvement in terms of Area/Speed/Power also would be a criteria).
If you are a back-end guy, the picture is different, everything you need to change, etc like TECH_Libs, Area, Power Calculations, Signal Integrity (SI), Yield etc.......
-Paul