Jane, first off there is no 'try' on WP8.1 as there is no way to go backwards. If you move up, there is no going back, but it is a safe release.
Yes, the plan is to bring Cortana to all platforms that have native OneDrive integration which includes XB1, and versions of windows after 8. However, it is still in beta, and it is going to take some time before Cortana rolls out across other regions in WP... so it will probably be after the win9/threshold release this time next year.
Not only that, but with the 'new and friendly' microsoft we may see Cortana released on other platforms as well. Not likely the same level of features and integration, but I would be surprised if in a few years we did not see a version of Cortana available for Android and iOS/OSX. This would be a cloud solution, so it would have limited local features and may not run as quickly, but it could still be very useful for those who need features of other platforms.
agreed. I am not into the Halo series, but even I get the general idea of who Cortana is, and think it is a brilliant crossover.
Same here, put it on my 920 and my wife's 520 and it works smooth as butter on both platforms. I am not a huge fan of voice controls, but it works extremely well, so I may make more use of it now. I do wish that there was a landscape view to make typing easier in Cortana, that is an oversight that really needs to be fixed. Also, there at least one Android smartphone/watch playing around with an always listening feature on their devices (can't remember which one off hand), and if Cortana had that then I would be much more likely to use it. The issue is that half of the time it is just as easy to do whatever needs to be done on the phone as it is to activate listening mode and issue voice commands. Still, WP had the fastest and best voice recognition before, and now it is infinitely better. That is the difference between purchasing a digital assistant and letting development flounder (siri), and making your own and helping it grow.