They have released 14 day trials that your friend should be able to download from Fileplanet. This has been available for a few months, so there are quite a bit of newbs at the lower and mid levels.
As far as changes...there have been a few "Issues" released in the last couple of years. With the latest I8, they implemented Veteran Rewards. Which basically gives you different powers, costume pieces, or other things based on the amount of time you played. One of the rewards is access to wings for your toon. If you reactivate your old account, your toon will still be available at whatever point you left off and you will get your veteran rewards according to the amount of time you originally had that account active. It goes in 3 month increments.
A few other minor changes have gone into effect here and there, but I can't recall all of them. It's pretty much the same game overall. They now have scanner mssions that have a lot of new content. You can get scanner missions from a detective in each zone, kind of like the newspaper missions from CoV. They have also added a lot of content in Pocket D where you can run missions with Villains. Giant Monsters tend to spawn more often also. And of course there have been several adjustments to the powers...nerfs and whatnot.
Another big change is the "Faultline" zone. It used to be a destroyed zone from an earthquake if you recall. Now it is being rebuilt and most of the zone is a normal city zone, but you can see that it is under construction. There are a lot of new missions in this zone as well as Arch Villains.
With the next Issue, or release, they are implementing an Auction House called "Wentworths." Heroes will be able to buy and auction off Salvage to build up their supergroup bases. I'm not totally filled in on the prupose of the auction house, but there's tons of info on the website.
All in all, it's the same game only it has been fine tuned here and there. I think it is still fun to play. It's still different from most other MMO's out there.