Just a heads up, r4team.com isn't related to the original R4 team. Simply running a whois on both sites confirms this as well as the difference in posting styles of "R4 Team" and the real people behind the R4. Also the site itself tips you off its not from the original team, there are no downloads on it, and if you do happen to find a download, it redirects you to r4ds.cn, the real R4 website. Basically it comes down to this, this isn't the real R4Team but most likely a group of people dedicated to the R4 who brought it upon themselves to make an update firmware for it. So basically, it will be an unofficial R4 update similar to what is being done with the R4 clones.
At any rate, for those with an R4, what I suggest is YSMenu. Its a very nice loader made by Yasu and works very well on the R4. I happen to own an R4 myself and happen to use YSMenu. All the games that didn't previously work on the R4 works on YSMenu perfectly. It has some features the R4 doesn't have and built in support for the EZ 3 in1 that lets you play roms right from the YSMenu menu without loading up GBA Exploder. YSMenu literally breaths new life into the R4. Also no matter what anyone says, its impossible to add SDHC support to the R4 without modifying the hardware. So don't expect miracles here.