Hey there fellow Dovahkiins

I have been researching this subject but couldn't find any info about it so here it goes :

Was there any official information about skill progression being improved in Skyrim or will it be just like in Oblivion where training some skills required mindless spamming because you just couldn't increase those during normal gameplay ( like restoration/alteration/mercantile etc. ) ?

It's mostly the same. The more you use a skill, the higher the level it goes, but this time EVERY skill count towards your level. There are no Major/Minor skills. That way you can do whatever you want(skill-wise) without class-restrictions.

I used restoration and alchemy alot on FCOM OB.

The other big difference is of course the perk choices. Before you just got bonuses based on the level of whatever skill you raised, now you get to choose those bonuses, and which skills get them. This is what's going to make Skyrim's progression system make Oblivion's look like [censored] even more than it already did that for itself lol

One way they've fixed this is by getting rid of spellmaking [flameshield]. Without the ability to create useless 1 magicka on self spells, you won't be able to spam them to raise levels. They could have fixed this without getting rid of spellmaking (and hopefully they've done this anyway) by making it so the magicka cost of the spell directly affects how much it contributes toward raising your skill.

Additionally, I hope they've incorporated more fixes to make it so things only contribute toward the skill level if they are actually useful in some way. For example:

Conjuration: Summons should only contribute if they actually take damage from enemies or do damage to enemies. Bound weapons should only contribute if you use them in battle.
Restoration: Healing spells should only contribute if they actually restore lost health; you shouldn't improve from healing when there's nothing to heal.
Sneak: Sneaking into a corner shouldn't contribute. I think only actions like stealth attacks, stealing, sneakily lockpicking/pickpocketing w/ people around, etc should contribute. And I don't see anything wrong with those actions contributing to more than one skill as long as you're actually doing something useful.

Those are just some of my examples. I just think you should only be able to get better at something if you do something useful in some way.