According to phonemag.com, few handsets are planned to be launched on April 16th

These new models include:

• LG LX400, a clamshell phone that compatible with Qchat push-to-talk network.
• Sanyo PRO-200, a slim clamshell phone with a MRSP of $249.99
• Sanyo PRO-700, a rugged design with dust, shock resistance. It has a MRSP of $269.99
• Blackberry curve 8830, the black version is already available and a new titanium edition will be added to the list
• Sanyo Katana LX, a budget slim phone in pink, black and blue colors

Finally, Sprint will also made Sierra Wireless 597 data card available in coming release Via PhoneArena.com