Microsoft's first Surface Book - indeed its first self-made laptop full stop - was unveiled in October 2015, almost out of the blue.
And recently we've had the Surface Laptop. Unlike the Surface Book, there's no tablet bit.
And hot on the heels of its recent education and software development events, Microsoft is known to be holding another Surface event on 23 May in Shanghai where the Surface Pro 5 is expected to appear.
The latest #MicrosoftEvent is reportedly taking place at 7pm local time, or 12.00pm BST in the UK, 13.00 CEST in Europe and 4am PT/7am ET in the US.
We’re having another #MicrosoftEvent. May 23 in Shanghai. Stay tuned… pic.twitter.com/gcJcaz1SsIMay 5, 2017
The event may be being held in China for a reason; there could possibly be some hardware specific to China in addition to a global announcement or two.
We know it's about Surface because Microsoft's Surface lead Panos Panay said "see you in Shanghai" on Instagram.
Surface Pro 5 release date
It’s been 17 months since the release of the Surface Pro 4 which is the same length of time that came between that and the Surface Pro 3 release. So it seems about time for the next generation to make an appearance - the 23 May date seems legitimate, so expect more news soon.
Surface Pro: the story so far
The Surface Pro series has been a hit for Microsoft, backed up by its decision to develop Windows 10 (and indeed Windows 8) as an OS that is at home in desktop or tablet modes. The Surface Pro 5 will aim to carry on and build on that success.
The range has certainly come a long way since 2013 when it first appeared. Back then, the hardware wasn't really up to scratch, and nor was Windows 8; since then, both the specs and the software have been improved, and of course the world at large has warmed to the idea of lightweight tablets that double up as laptops if you stick a keyboard on them.
The Surface Pro 5: rumoured specs and features
The rumours point to a similar starting price point of around $900 in the US and £750 in the UK, while a rechargeable stylus is on the cards.
Battery life should be better as well, which will come as a relief to a lot of existing users - a so-so battery life level is one of the few major complaints to be levelled against the Pro 4.
Aside from the latest 14nm Intel Kaby Lake CPUs, we haven't heard much in the way of specs for the Surface Pro.
A 4K screen might be on the cards, and it would make sense if Microsoft upgraded the series to support the USB-C standard too.
Perhaps there will be a Windows 10 S option - that would mean even better battery life thanks to it being able to use Windows Store apps only.
- Check out the 10 best Windows 10 laptops, tablets and 2-in-1s right now