for your reference:
IBM will announce two new System i models, 515 and 525 on Apr. 10.
Model 515 is focus on SMB new acquisition with attractive price for
total solution including BP/ISV solution and System i 515. Model 525
is the replacement of model 520. i5/OS user based licensing is also a
new approach for SMB customers. For model 550/570/595, i5/OS
application server is for second partition which not use database to
significantly reduce the i5/OS license charge.