
Being on the same servers as everyone else for RP is indeed what Ive been looking forward to. 
As for SE designating an RP server I fall into the "not really bothered" camp. Yes it would be nice for SE to recognise RP groups and yes it would allow people who otherwise may not be able to find out about roleplaying in FFXIV to locate it easily. There are other aspects of it as well, people who dont RP may pick a RP server to play with a seemingly more mature set of people, and of course there will be others who pick a RP server to openly harass Roleplayers.
If they don't designate an RP server (and I personally imagine this will be the case) then we pick one ourselves, easy enough. It of course has a couple of drawbacks, potential roleplayers may have to do a little work to find out what our chosen server is, and there may be a few disgruntled "anti-rpers" who complain about why we had to pick "their" server to ERP (misconceptions abound). The upside being that we get more roleplayers who put a little effort in to find the community, and we get to decide the size of the server we want to join, in theory.
The most important thing to me is there is a server, SE designated or player designated is doesnt matter, that the roleplaying community all converges on. It would suck to see it so spread out again like in FFXI.
Additionally: to the point made above, taking WoW as an example. Lots of people (maybe a majority im not sure) of people who roll a toon on a RP server wont RP anyway so I dont think it would be too hard to make non RP friends, but aside from the griefers I think it may contain a few more RP friendly denizens? Im not sure its been a while.

As for SE designating an RP server I fall into the "not really bothered" camp. Yes it would be nice for SE to recognise RP groups and yes it would allow people who otherwise may not be able to find out about roleplaying in FFXIV to locate it easily. There are other aspects of it as well, people who dont RP may pick a RP server to play with a seemingly more mature set of people, and of course there will be others who pick a RP server to openly harass Roleplayers.
If they don't designate an RP server (and I personally imagine this will be the case) then we pick one ourselves, easy enough. It of course has a couple of drawbacks, potential roleplayers may have to do a little work to find out what our chosen server is, and there may be a few disgruntled "anti-rpers" who complain about why we had to pick "their" server to ERP (misconceptions abound). The upside being that we get more roleplayers who put a little effort in to find the community, and we get to decide the size of the server we want to join, in theory.
The most important thing to me is there is a server, SE designated or player designated is doesnt matter, that the roleplaying community all converges on. It would suck to see it so spread out again like in FFXI.
Additionally: to the point made above, taking WoW as an example. Lots of people (maybe a majority im not sure) of people who roll a toon on a RP server wont RP anyway so I dont think it would be too hard to make non RP friends, but aside from the griefers I think it may contain a few more RP friendly denizens? Im not sure its been a while.