They said they are unsure whether there will be any service packs for it, and they are also not clear on how long Silverlight 5 will be supported by Microsoft.
Several of my customer and partner contacts have told me they have heard from their own Microsoft sources over the past couple of weeks that Silverlight 5 is the last version of Silverlight that Microsoft will release.
Silverlight 5, the most recent - and possibly last - version of Microsoft's cross-platform browser plug-in, is poised to be released to manufacturing (RTM) before the end of November.