I've just finished the Poland scenario in the '39 campaign using the latest beta release. Didn't find any glaring errors, so I'll post some thoughts/reactions:
1. I like the new low ammo/fuel icons. Really helps keep track of units that are in danger of losing supply. I assume "red" means you are out, how much ammo/fuel do you have in order to get the "yellow" danger icon?
2. Also like the icon for units that have fired/not fired. However, it seems you've removed the icon (slash) for units already moved. I hope this is not permanent, as now I have trouble telling what units still have movement left. Please bring this feature back!
3. For the most part, unit visability on the new tiles is good. However, I still think that units on hill terrain (such as hex 6,17 in the Poland scenario) need to have shading as well. Hope this gets added.
4. I don't like the new supression function. It seems that supression is too "light" now; more than one "round" should be instituted. Maybe a variable amount of rounds instead, so that a player knows there is a larger "window" for the supression effects to last, but doesn't know for sure just how long that is (and hence should move quickly against said supressed unit)?
5. The weather icons are clearer, but I still think the pop-up underneath should say what the weather is.
6. Glad to see the hot keys have been added to the pop-up windows for each function button.
7. I like the new armored unit sound, but maybe a bit more variety (some units could use the "old" sound, others the "new" sound)?
8. LOVE the new campaign screen... but the German-style text for each campaign name is a bit hard to read. Another typeface, maybe? (And just what is the unclickable 1936 campaign in the middle of the screen there for?

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Overall, things are really looking good with this latest beta. I'm going to continue playing the campaign I started under the previous beta (Sea Lion 42), as well as the newly-started campaign in progress (Norway).