Supposedly..Famitsu is reporting that Namco is testing a new version of Tekken 5 DR. This new version will sport a much needed practice mode and a new online play component. So far this is only for the Japanese market but it is likely that it will hit the US market once the japanese one works well. This won't be a free upgrade though, you will have to pay to download the game again or to upgrade your existing download.
More to come.