We will definitely see Clara again in "some form" according to Steven Moffat before the end of the series.

http://www.mirror.co.uk/tv/tv-news/c...o-exit-6874832

Im not a big fan or regular here so probably been discussed, but what happened to the extra life Maisie had and couldnt it have been used?

If you mean the extra healing/immortality chip that the Doctor gave her, she used it in a previous episode saving Rufus Hound's character.

Of course you will. Why else is there pics of her in the finale.