I haven’t seen anything about the pix 515E
Q. How long will the Cisco PIX 506 and 515 platforms be supported?
A. The support schedule for the Cisco PIX 506 and 515 platforms is as follows:
* End of sale: May 24, 2002 (no longer available for purchase)
* End of software support: May 24, 2005
* End of hardware support: May 24, 2007 (hardware repairs or exchanges are no longer availabl
See this for more info.
Hope that helps