According with http://xplane10.wordpress.com/2011/11/06/xp10reviews-lelystad-fsweekend-coverage/

“PMDG has both their 737NGx and 747/400 for X-Plane 10 on display in beta form. More to come as Robert reports in. (update: read Roberts report for the real scoop here). Austin also reports that PMDG received a beta of X-Plane 10 two days ago and is considering converting their gorgeous 737 and 747 to X-plane. “

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De acordo com http://xplane10.wordpress.com/2011/11/06/xp10reviews-lelystad-fsweekend-coverage/

A PMDG tem tanto seu modelo B737NGX como seu modelo B747-400 já na versão Beta do X-Plane 10.

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PMDG forum: http://forum.avsim.net/topic/353175-ngx-and-744-for-x-plane/