Regarding Israel:
It seems likely that with much greater Zionist participation in the Allied war effort, there will be a quid pro quo of much greater Jewish immigration into Palestine. Also, Britain may give the "Hebrew Legion" the peacekeeping/police role that OTL went to the Arab Legion. This could neutralize the anti-British sentiment among extreme Zionists (e.g. the Stern Gang and Irgun).
Thus, by the end of the war or soon after, there could be a solid Zionist majority in Palestine which has de facto control of the the territory.
This will offend many Arabs, but there is little they can do about it. Abdullah has much bigger fish to fry and needs to stay friends with Britain; picking a fight over Palestine would endanger that. Alawite "Syria" doesn't border Palestine and is busy trying to survive. Lebanon is minimally interested. The Arabs in Palestine are disorganized and outnumbered.
Most likely, the Zionists oppose partition, and nearly all of the Arabs submit. The new state of Israel will include an Arab minority, as OTL, with citizenship and voting rights, as OTL, though substantially larger. There will be no "Nakba" as such, and no mass of aggrieved refugees to inflame Arab opinion. Most Palestinian Arabs will see participation in the new state as the most promising course. The Nashashibi clan may have a comeback. There will be friction, of course, but the animosity will be trivial compared to OTL.
There may still be mass migration of mizrachim from Arab states to Israel, but the demography of Israel will be more European.
Also, Israel's national culture will be very different, without the heroic narrative of 1948 as its founding. The deeds of the "Palestine Division" may serve as a feeble substitute. One also has to wonder how OTL Israelis dealt with the fact that after 1948, a great many of them occupied abandoned Arab houses. ITTL, that doesn't happen; instead Israel has a huge housing crisis as they seek to provide for the influx of wartime and post-war refugees. (I believe there was such a crisis OTL, but it will be much worse ITTL.)