It feels very much like previous Fallout games.

The dialogue choices are in the same style where you can say wacky things, be condescending, good or evil, and lie. There's nothing different there except adding in tons of voice to NPCs. It's similar to how Fallout 2 had major NPCs with voiceovers.

Weapons are in the same categories as before. You'll recognize many similarities with weapons. There's also the addition of a few more new weapons that you may have seen in trailers.

Random encounters are very different due to the change in game play style. You still get random encounters but it's based on how you walk through the world. It's not a dice roll to see if you get stopped during fast travel like in older Fallouts. There are still random things you can bump into during your exploration. I've been in the subway and there is a lot to explore that's unrelated to any quests.

It can be a slow game if you want to complete all the side quests. It's slow walking around in the beginning or to a new place. I'm heading into the more urban areas and it's hard finding a path so it's taking a long time. There are things to do and not just killing random enemies.

Character development seems slightly simpler than before. There aren't as many skills to put points into. You get perks every level now. There's still a lot to balance out though. You can't boost all your weapon skills and wield everything like a pro. Well, you might be able to but you'll lack skills in other important areas like repair, medicine, lock-picking, or sneaking. I'm carrying or storing a lot of crap but I should get rid of it because I haven't focused on big weapons.

As a fan of previous Fallout games, this is a great continuation of the franchise. It has the same feel and it's a new world to discover from a different perspective.