It seems there is nothing but bad news for current X10 family users. Sony Ericsson have announced that they have dropped the DLNA that they promised back in May 2010.
However, with that said, they are saying that there are loads of DLNA apps from the android market (which I suspect what most people have been using since the handset got released)
Rickard Skogberg answered more questions from the MWC on Sony Ericsson’s Product Blog, which you can read here

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Never used DLNA much anyways, if i like music i put it in the phone
How is this bad news for X10 owners when there have been media sharing apps available for months?
[...] is no longer coming to the Xperia range. Sony Ericsson has instead directed their users to the Android market for third-party [...]
[...] is no longer coming to the Xperia range. Sony Ericsson has instead directed their users to the Android market for third-party [...]
I still don’t use DLNA with my TV or any supporting device…Not fond of it.