The FIM has announced decisions from a meeting held today (June 15th) which mean updates in both technical and sporting regulations
Here is the specific nature of the changes…

Technical Regulations

MotoGP Class – Effective Immediately
Currently riders may choose to change up to two sets of their rain tyres for an alternative specification only after the first wet practice session. In future they will be permitted to change to the alternative specification at any time during the event.

MotoGP Class – Effective 2014
It was previously agreed that in 2014 Manufacturers using the official ECU but their own software will have the specification of their five permitted engines frozen for the season. The specification remains frozen if extra engines are introduced.

The GPC agreed the procedure to be followed by Technical control to monitor and enforce the frozen specification.

Sporting Regulations

Moto2 Class- Effective Immediately
The maximum age limit for wild card riders in the Moto2 class has been cancelled.

All Categories- Effective 2014
In line with other FIM Championships, flag signals will always be made by the waving of flags. Previously there were situations where a stationery flag was displayed and this option is cancelled.

Other Matters
Various other issues affecting the MotoGP class, including amendments to the claiming rule and the details of Electronics (ECU) regulations for 2014 were discussed. Final decisions on these matters have been postponed to the next meeting scheduled for 29th. June in Assen.

Source: FIM