To the best of my knowledge we have not been given any indication as to when the next DXP event is actually going to be.
Unless someone can find a Redname post that clearly says otherwise, anyone who has been telling you when one is going to be is fabricating things.
By my reckoning, placing one around the I15 release would be somewhat counterproductive, as the Issue itself should be enough to drag many people back - perhaps a month after it goes live would make sense, as that will snag people into re-subbing. Then there's the fact that GR is due at some point, and that's going to be a big draw on its own. On top of that, we have hints regarding Issue 16, which would suggest that it is getting closer to reality. So many things coming that will traditionally bring back old players, for the moment the game doesn't really need a DXP event. So, if I were the devs/marketing gurus I would offer I15 with a free account weekend, wait a month and then throw in a DXP event, assuming that I16 or GR aren't coming up soon.
The wisdom of Shadowe: Ghostraptor: The Shadowe is wise ...; FFM: Shadowe is no longer wise.
; Techbot_Alpha: Also, what Shadowe said. It seems he is still somewhat wise 
; Bull Throttle: Shadowe was unwise in this instance...; Rock_Powerfist: in this instance Shadowe is wise.; Techbot_Alpha: Shadowe is very wise *nods*; Zortel: *Quotable line about Shadowe being wise goes here.*
I think that perhaps we've become used to them being every 6 months which may give the impression that we're due another one soon. I agree with Shadowe though, with everything that's coming our way soon (presuming it's not too far away) there wouldn't appear to be a need for one.
I'd be happy to be proved wrong though. 
@Dante EU - Union Roleplayer and Altisis Victim
The Militia: Union RP Supergroup - www.themilitia.org.uk
I don't think they'll be a DXP weekend anytime soon.
Which is a very wise thing to do.
The devs will probably want to sort out MA before anymore DXP weekends happen.
If people can get from 1-50 using MA in like 4 hours, how many new 50's can players get over a weekend of double xp??
Although saying that. If XP was only dev created content and didn't work in MA, it may attract some players out of MA for that weekend, and they may enjoy the normal missions and not return to MA.
It's now Issue 21 and I am back!
My new Global is @Zyhar
Currently enjoying the Exalted Server!
tbh i didnt really care myself for lvls this time more for the inf.
ill let my friend know to just watch the forums if there is one
Whens the next dxp to hit us? ive heard its in a few days a week even 2?