I was up that way last week, there's still a lot of snow high up on Ben More and Stob Binnein it's very soft as you'd expect with the heat. The forecast is for it turn cold again over the weekend and into next week, so it won't be melting very fast. If things stay as they are expect lots of snow, if it turns warm and wet much of it will be washed away. Basicly anything can happen between now and when you arrive, keep watching the weather forecasts.
If it is snowy it will be wet and soft so probably no need for crampons, gaiters I would say are a must in wet snow. How much practice in ice axe arrest have you had? If you know how to use one it might be worth carrying an axe but you may well find you can just walk around all the snow patches. You can also use your axe to control your speed when bum sliding, always great fun. Even in Scotland sunscreen and dark glasses can be need so don't forget them, other than that just the normal walking stuff.
Which way are you planning to go?