Originally, the HTC Sensation was scheduled for a May 12 launch in this country. According to SFR, the cause of the delay is a software update by HTC.
It's yet to be seen whether the HTC Sensation will be launched on schedule in the UK (i.e. on May 19), where its exclusive carrier is Vodafone. Rumor has it that the HTC Sensation 4G, which is the T-Mobile version of this quite exciting handset, will be released on June 8.
source: SFR (translated) via UnwiredView