I got 2 question does it need a new game for survival update and will the game type be locked when chose like survival hardcoe then lock forever

No and No. Supposedly.

Are either of you able to use Survival mode now? In turned mine on in the gameplay menu. But my PC is still able to fast travel and do all the things he could do before the patch update.

indeed would be cool if it was like OP say,s , wondering they said enemy,s would respawn this does includes Legendary,s and theyre drops

This patch didn't include the survival mode overhaul. We still have the original survivor difficulty setting, the biggest effect of which is slower healing.

Supposedly being the key word here.

Sadly there hasn't been a lot of info on survival mode since it was announced.

That's the old Survival mode..

To be honest it should be locked at character creation, so therefore a new character would have to be created. That's how it should be but we'll find out soon enough. I honestly fail to see the point of a survival mode with save, fast travel and a host of other restrictions that can simply be switched to easy mode and back again. It makes no sense at all from a game design standpoint.

So I am going to say, yes a new character will be required that is locked to that mode.

From the Reddit leak that Bethesda confirmed it was stated that you simply go into gameplay options and change it there during a game.

That's why I said "supposedly".