You're probably thinking of the OVA or original video animation. They're usually really short and the one for jojo only had like 6 eps for each ova. They're announcing a full fledged TV Anime done by the same people who did Part 1 and 2, and will hopefully be around 26-39 episodes.
To answer your question bluntly, no.
Holy crap, hopefully not 39 episodes. We want to get to part IV and beyond eventually, right? Preferrably, I'd like them to get it in the 14-16 episode range (the whole arc was kind of bloated anyway) so that the second half could be part IV, which could be compressed to 10-12 episodes.
I doubt it'll feel bloated anyways with the # of chapters they usually pack into 1 episode.
I actually think they'll make it in 30+ chapters. And maybe they'll add some escenes to the battle to make them longer like the battle between Wham and Caesar. That'll be awesome.
Agreed, I definitely don't want them to leave out alot of fights, which would happen if they did only 25 eps for 150 chapters worth of material. If they keep it around 3-5 chaps per episode, they can easily get it to reach 3-cour.