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There are three different Plan K offers. Hosted Exchange Online only is available for $24 per user per year. Hosted Exchange plus Hosted SharePoint (Plan K1) is $36 per user per year. And Hosted Exchange, Hosted SharePoint and Office Web Apps access (via SharePoint) (Plan K2) is $120 per user per year.
There are four different Plan E options, ranging in price from $120 per user per year, to $324 per user per year. These are known as E1, E2, E3, and E4. Both the E3 and E4 options include for each user a copy of Office Professional Plus -- Microsoft's highest-end Office 2010 SKU -- to be used on client PCs.
Office 365 for Education is Microsoft's counteroffer to Google Apps for Education. Like the other Office 365 SKUs, it includes an option to purchase the Office 2010 Professional Plus SKU for those who want to run it locally on users' PCs.