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It is possible that Microsoft may reveal Office 15 soon. Specially for the Windows community will get to savor it before the launch of the Apple iPad 3. With Office 15 expected in line with the Windows 8 release it may be unlikely to see it sooner on the iPad.
There is no news on the pricing of Office for iPad, previous rumors suggested that Word, Excel and PowerPoint will be individually priced competitively with Apple's own Pages, Keynote and Numbers apps. However if the leaked image is true it looks like the entire suite will be packed into a single apps.
Currently there is no news if Microsoft Office will make it's way to Android tablets. For now Microsoft looks to take advantage of Apple's tablet popularity while the release their own offering to the tablet market later this year.
source - The Daily