Will upgrading from 11.10 to 12.04 restore Unity?

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http://askubuntu.com – Yesterday, I upgraded my Ubuntu 11.04 tot 11.10. After some trouble I managed to remove Unity and I installed gdm & gnome-shell as a replacement. I configured it a bit: installed some extensions, changed some themes, etc... My question now is: What will happen if I upgrade my 11.10 to 12.04 (and afterwards to 12.10)? Will Unity get reïnstalled and if so: will I lose all my gdm modifications? Thanks in advance! (HowTos)