Yesterday I installed the beta patch and faced the senate loyalist revolt:
The senate royalist spawned in athenai with a few legionary armies and a few fleets.
My best army was in the Provincia, so too far away. 2 other armies were in Ephesus/rhodos and another one in Illyria.
Since I was still at war with Rhodos, which is quite big, I left one army in ephesus and tried to sneak the other one from rhodos to crete and then land in sparta, which is my client state (and refused to help me against the loyalist).
The army from Illyria moved in forced march to protect appolonia.
I recruited a few more armies, one in rome, one in macedonia.
The loyalist attacked Larissa with one army of mostly legionaries and some skirmishers and cavalry. My garrisson was 1 legionary, 3 rorarrii, 5 plebs and 2 leves. I defended the capture point, which was accessible by 2 entry points. They send their legionaries by one route and their skirmishers by another, so I shattered them. I also took out their cavalry and some legionary units, but in the end it was hopeless. Got a close defeat out of it, which is more than I expected from such a weak army against legionaries.
3 armies force marched towards appolonia. 2 fleets and one or 2 armies besieged/blockaded pella with one army of 4 veteran legionaries as extra garrisson.
I decided to be bolt and attacked the force marching armies near appolonia with my army that arrived from Illyria:
They could not reinforce each other, so I could fight them one at a time. Also, since the beta3 patch made forced march battles ambushes, I destroyed all 3 armies, with most of my own units having more than 1/2 strength left.
I moved a unit from Italy to garrisson appollonia against the remains of the 3 armies and moved my large army to save pella, which was quite easy. Meanwhile, my army from Rhodos assaulted athenai with only a not fully developed garrisson inside.
The army that had taken larissa from me forced march into the woods above pella and could evade my army for a while. I took larissa the next turn and their remaining armies started deserting. One final ambush battle destroyed 1300 legionaries within a minute, and they were gone.
I chose to remain a republic, since the description suggested that the power of the enemies is broken and they wont rise again. With the empire I expected what happened in real history: lots of civil wars.