I've played until October 1915. First I'll discuss what happened outside of the Middle East.
The bold French offensive kept on for five more months, taking massive casualties but liberating Belgium up to the Meuse. A bridgehead was then established on Liege, but quickly pushed back. Several German counteroffensives then failed to cross the river, and trench warfare finally set in. The first British air battle of the war took place in these combats, and ended inconclusively -low tech air wings are too weak to cause any major damage to ground units or each other.
In the North Sea, I had a decision to blockade Germany by parking my fleets in front of German ports. My numerical advantage made it easy to do, but to my disappointment, all it did was a slight nerf to German IC. I then kept my fleets parked, and thus every once in a while they wiped out pairs of clueless DDs and CLs returning to port. A few months later, the same happened to a pair of German battleships, but the ensuing battle damaged some of my own and I had to shuffle around my fleets and send one of them back to port. And for some unexplained reason, Germany later lost that nerf and I myself got an event telling me that my ports were blockaded, even though no German ships were in sight and nearly the entire Kaiserliche Marine was stuck in port!
Production-wise all of my divisions in the Western front are furnished with extra artillery by June and I shift my industry to more infantry divisions, interceptors, bombers, and, for variety's sake, armored cars and super heavy artillery (even Canada is building it!). Divisions in the Middle East did not receive any artillery due to the importance of mobility in that front. I also upgraded a few militia divisions to infantry.
Italy entered the war on the 25th of March. They took a single province in Tyrol and then stopped. With the Western front reduced to a defensive position, I managed to ship six divisions to their aid. Casualty rates in that front are the worst I've seen.
Serbia gives up on the 22th of April, in large part due to an ill-conceived plan of mine to ship all of their divisions to the Middle East -it worked for Belgium in WWII, but was a disaster now; Serbs just disbanded their divisions and went back home upon learning of their defeat.
Greece joins on the 13th of May. A n Indian corps earkmarked for Palestine was immediately sent to reinforce them, and over time I dispatched more and more divisions, allowing me to launch a minor offensive into Skopje to secure better defensive positions.
Bulgaria entered the war on the 5th of March.
In Africa, Kamerun falls to the French by May and Von Lettow Vorbeck surrenders with a ragtag band of just 50 men in June. Divisions are slowly transfered to the Middle East.
Russia continues to fail, with the Central Powers encircling several divisions and reaching Kiev and the Baltics. Their revolt risk is high, and there was even an uprising in Finland. Revolution is imminent.
The following table is a comparison of Commonwealth troop strengths on several theatres on four different moments:Number of divisions__
The increase is not just from my own production of infantry divisions, but also from the arrival of Commonwealth forces from abroad -two Canadian corps in the West, two Australian corps in the Middle East and a New Zealander infantry division in Iraq. The Anzacs, however, are annoying to handle: for some reason you can't just embark a division in transport ships on Wellington and tell them to ship it off to Alexandria; instead, one must ship them to Brisbane, Darwin, Singapore, Colombo etc. And manually check if they've arrived at each of those stops, which I always forget to do.