Please remember that these are rumors, and such are always taken with a grain of salt.
One would hope it'll stay the same (it won't go down), but knowing GW.. it'll probably see a price increase.
The "RRP" I've seen is 75 pounds
Thats about 118 dollars
via Harry on Warseer
There IS a limited edition starter set. Limited run of 5,000 copies I think is what I heard.
I do not know how it differs from the standard starter set ..... but I suspect not that much?
Any notion of split starter sets or multiple starter sets for different armies is. in my opinion, total bobbins.