Hey! I'm an avid follower of Heroes, and sadly, these 5 episodes are the last for this season. It will be available on DVD sometime in the next few months, most likely in September or October before the show starts back up for season 2. In fact, if you have Netflix, they already have it up on the site so you can go ahead and put it in your queue.
If you wanted to catch up really quickly though, NBC has all the episodes (18? I think) up streaming on their website for people to view until April 23, when Heroes comes back. I know that they have also created various videos that sum up the entire season to date, to make it easier for people to catch up.
Hope that helps!