We've just learned the base pricing for the 2015 M3 (F80) and M4 (F82)!
2015 M3: $62,000
2015 M4: $64,200
These prices do not include the $925 destination/handling currently (always subject to change).
Added (in response to a member's question): Manual transmission is standard and included in base price. DCT will be add-on option.
This represents a not insignificant increase in base price for the M3 compared to the predecessor E90 M3, but keep in mind that it now comes equipped with a carbon fiber roof and factor in inflation since the last M3 sedan.
Also see:
Timeline for BMW M4 / M3 Pricing, Ordering, Delivery and European Delivery Dates