Let's try)
1. Yes.
At least the following E features (comparing to the May 2022 Exterior release) worth mentioning:
- Improved 3D model
- True 8K textures with livery packs support
- Functional flare dispensers (true to life physics)
- Optional (removable) external tanks
- Optional engines smoke effect
- More CS signature animations
- Now all of them can be operated separately with the animations control panel
- Quite a number (hundreds?) of high resolution decals added.
- Connection to the new C-130 cockpit controls and systems.
2. No. The E and the H are diffrent airframes and separate products.
3. Yes.
4. Release is the best announcement.
5. Not sure about "should" but you can)

Before I decide to purchase the C-130H, I have a few questions...

1. Is there a roadmap for future updates?
2. Will it continue to be updated (or approximate time between updates)?
3. Is a glass Cockpit planned for the H?
4. Is the C-130J planned?

Thanks for your time.