Yes Mark, that information is correct.
UKBA recently issued a news item on that some time ago called Changes to the requirements for biometric residence permits
I'm surprised that your wife has not already be informed about that by UKBA.
Anyway here's some more information from their website about Biometric residence permits
If you read the info you'll notice this statement:-
Not sure how UKBA will write to you, unless a letter was included when the visa was granted.If you applied in a category that did not require you to enrol your biometric information and your application is granted on or after 1 December 2012 you must apply for a biometric residence permit. We will write to you and explain how to apply for a permit
I would suggest a trip to a Post Office providing that service
I'm not aware of any specific time limits, but no reason to panic and no reason not to apply soon after she arrives.
Take a look down at the bottom on the webpage and review the links there.
On the right-hand side under 'Related Documents' you'll see the UKBA PDF called 'Biometric Residence Permits - application process
Here's also something from the Post Office on Biometric Residence Permit FAQs
Actually Everyone who does not already have one should make arrangements to get one asap.
Just focus on having your wife arrive to UK then think about the Bio![]()