North Epirus for certain, a dual monarchy with Albanians had been aired by both sides more than once pretty 1878 but otherwise no interest further north than roughly Heimarra-Tepeleni. In Macedonia it was mostly the hoped for end game in OTL, with the exception of Monastir where the Serbs got first and the Gevgeli -Strumica strip. In Thrace I'd say the entirely of the Adrianople and Constantinople vilayets, after all as late as 1947 Greece in the Paris peace conference asked for territorial adjustments with Bulgaria putting the border north of the modern one (I understand the schemes run between 2000 square km and as much as 16,000). That though had been driven by military considerations too by then, Greece had been invaded by Bulgaria 3 times in a single generation and a fourth looked likely. So an end game not much to the north of the modern Greek border, say along the Ardas river may well had been more likely if we are talking about 1910.