I am rooting for an XMPP comeback.
But I think the major hurdle in this situation is (as usual?) not about an well organized colorful emoji library, but offering something that is clearly better than what we have now in order to disrupt the status quo. :(
It's not planned. To be precise in the beginning nothing will change for the players. They might be able to send messages which are four times as large.
As far as i know a modern more modular design was the main reason. And thus offload some of the CPU utilisation to not-game server.
More comments from the Dev here [0] and partly [1] here.
[0] https://forums.eveonline.com/t/dev-blog-new-chat-backend-com... [1] https://forums.eveonline.com/t/dev-blog-preparing-for-the-fu...
(Filter by clickning on the blue [DEV] avatar near "Frequent Posters" and select 'x post in this thread' to only see posts from that developer.
EDIT: Or maybe Android users; looks like GCM is also XMPP behind the scenes.
I noticed something interesting while looking; it appears that at least one public XMPP server has experienced a recent large influx of new users.
>"The number of daily active users has increased more then three-fold in the last year alone." [1]
[1] https://jabber.at/b/temporary-suspension-of-registration/