I doubt that they would go for Greece and Anatolia right after Balkans. The only pattern that SCS follows in ETS2 DLCs is making the next DLC in unrelated direction to the previous one.
Italy = South
Beyond the Baltic Sea = Northeast
Road to the Black Sea = Southeast
Iberia = Southwest
Heart of Russia = Farther(?!) Northeast
West(ern) Balkans = Closer(?!) Southeast
Following this pattern, they would probably go for either north Scandinavia or Ireland and (perhaps) Iceland. Yet, for the latter one, they need to rebuild the UK from scratch first. Instead of them, they may even decide to release Heart of Russia after West Balkans if and only if, the currently ongoing war ends by then.