What else, they will simply add the new Typhoon 25mm gun (plus
Mistral/Igla combo) at the aft, and possibly more soft kill aids,
such as long range chaff, torpedo decoy systems or even a hull
mounted mine detection sonar... 
The MCVs are suited for Littorial wafare instead of open sea as
they are not very stable in high sea state due to the huge mast.
However, their speed and agility to manoevur in relatively shallow
waters make them excellent Littorial warefare vessels.
I think the a fleet of ST Marine 81m OPV makes good supplement to
the Formidable. However, I would think that some improvment to the
structure design for higher degree of stealth and greater weapon
load should be done on the OPV (eg. don't see VLS on the vessels -
should be armed with at least 16 to 32 Baraks, and possibly a
locally designed CIWS).
but then again, these are just my guesses, personal opinions and
speculations...
