R200 End-of-Life date

Depends on what you mean by EOL (End Of Life) - end of sales, end of warranty, end of parts supply?

Sales - the R200 is dead.

Warranty - typically renewable for up to 5 years from the shipping/purchase date.

Parts Supply - depends ... Dell may have already stopped stocking certain parts, others may be stocked for years to come, some may be stocked only for in-warranty systems and available for general purchase through tech support on a case-by-case basis.

Dell does not usually set fixed dates on any of the above.  I doubt they have any hard and fast dates internally either, as they seem to base everything on system parts availability, reorder information, and upcoming releases.  Even if they have internal dates, they are not announced publicly or even to support staff.