I think the most important change is the sensor model.
Tiny fighters will rule missile combat, at least without a ridiculous investment into stealth, electronic warfare, sensors and fire controls.
Carriers will probably be somewhat attractive. Changes to the engine model mean independent long-range fighters would have lower performance than they do now.
I think it's important to consider the substantial improvement to EM sensors in this dynamic. Quoting Steve;
Active Sensor Range = SQRT((Racial Sensor Strength * HS * Racial EM Sensitivity * (Resolution ^ (1/1.5)) / PI) * 1,000,000 km
EM Detection Range = SQRT(Racial EM Sensitivity * HS * Target Signature ) * 250,000 km.
Active Sensor Signature = Resolution * Racial Sensor Strength * HS
This means that the size of the EM sensor required to detect an active sensor at its own range is given as:
Required EM HS = (16/PI) / (Resolution ^ (1/3))
Average fighter sensors will be in the 2-5 HS range, high-resolution sensors will be needed to remain competitive at range.
For a conservative 80 HS resolution sensor, the required EM sensor is only 1.20 HS.
For an optimistic 16 HS resolution sensor, the required EM sensor is still only 2.10 HS.
For a large 4 HS resolution sensor like on a major warship, the required EM sensor is 3.30 HS
For a 1 HS resolution missile sensor, the required EM sensor is 5.10 HS
Even accounting for the fact that missile fire controls are four times as quiet as active sensors, a ~400t EM sensor is neither very expensive nor so large that it cannot be spammed. It's absolutely possible to stuff EM sensors as large as 800t into a major warship.
And electronic warfare isn't too expensive either. The first tech is only 5000 RP, and it's not likely you can just skip it considering how vital it is for both missile and beam warfare. Obtaining effective ECM or ECCM for fighters is an added cost though, and the 15t version is a flat 20% less effective than the full-sized 150t version. Closing the range further reduces the required EM sensor size.
IMO, fleet combat will likely turn into a peekaboo game of who flicks their actives on first, considering passives will mostly outrange them. Fighters will still be somewhat useful as expendable scouting assets, but drones might be better at that.