Who is your target audience for this presentation? It doesn't do enough to say 'why' someone should adopt Swift (and use your services), be them a developer or business owner.

Also, be careful - the first two slides might give the impression that in order to use the new features in iOS 8.0, one must adopt Swift (which isn't true). "Mapping Obj-C to Swift" contains some inaccuracies that may be clear when you give the presentation but written down don't make sense (e.g. "-" becoming "func").

"#define changes to let"

God, no. You shouldn't declare your constants with #define...