The latest edition of Macmillan English Dictionary update has a brilliant feature on how new words are created, which is perfect revision for A2 students looking at Language Change. It explores processes like blending and compounding as well as looking at completely new words. Have a look here for more.
On the subject of Language Change, Beth Kemp's English website for King Edward VI College, Nuneaton. has some good revision material for this topic (and others) and has recently been updated. You can find it here.
ENA5 Language Change (Contemporary Language Change essay question)