With Windows 10 for phones around the corner, at least in a preview, the question still on many people's minds is 'What about my phone?'

The issue is both simple and complicated. Let's break it down.

Short Answer

Yes, all current Windows Phone 8 and 8.1 devices can get Windows 10 as an upgrade. Sure, there could be some restrictions (mostly the camera), but the Lumia 530 and Lumia 635 are just as likely to get this update as the Lumia 1520 and Lumia 930.

Microsoft was certainly showing off all of their current phones with Windows 10 today and boasting about this fact.

Even for the Windows 10 preview program, all of those phones should be able to get the upgrade. Microsoft has said this for a while now, so this isn't even news. However, I can state that as of today, they are still sticking to that message.

Longer Answer

Carriers. You know how they are. They still play a role in which phones get updated and which do not so they still have some power here. However, since Microsoft has a preview program (both for early builds and one for later builds), people have options.

Flagship and release

As mentioned earlier, Microsoft was hitting the message hard that a flagship Lumia phone is on the horizon. Ifi Majid, director of product marketing for Microsoft Mobile Devices, mentioned that such a phone (and updates for current phones) were likely "later this summer".

For some time, I have noted that I do not expect a flagship until summer time, aligning with a proper Windows 10 release, and this is still the case. I'll have more on this maybe tomorrow as to my thoughts about how and why on this timing. For now, I'd plan on that timeframe.