It’s here: Microsoft’s Cortana beta version has been unveiled for the iOS, and there are going to be some significant changes.

A small, exclusive group of people have received an email that features an invite to try out the new Cortana Beta, according to a PC Mag report.

Microsoft’s aim is to have Cortana available on a range of its platforms, so that a user has access to her no matter what platform he or she is on, be it a PC, a tablet, or a phone. And as it turns out, Microsoft doesn’t want that to be limited to just Microsoft products: “we also know that there’s a choice of mobile devices out there, so we want help from our Windows Insiders to make sure she’s a great personal assistant on iOS too,” Microsoft wrote in a blog post earlier this month.

Not all Cortana features will be available on iOS phones — for example, voice commands — it could be “the perfect companion to your windows experience,” the company states.

So what’s different about Cortana Beta? That’s the mysterious part, but there are some activities that users will be asked to try out that give some clues, such as setting a reminder on a Windows 10 PC and seeing if something changes on your iOS device at the same time. Users will also be asked to have Cortana schedule meetings to see if she can do it consistently. Also, Microsoft wants Cortana to sound real, and wants to see if the user experience reflects that.

There will undoubtedly be plenty of changes down the line, and many of them are likely to be driven by what these beta users find as they use Cortana Beta.