Yes, this delay was unsatisfactory.
There is no separate “IVA Release Letter” for IVA 5.60.
Information about IVA 5.60 can be found in the “CPP Release Letters” of firmware 5.60 (Bosch_Releaseletter_CPP_H.264_FW_5.60.1206.pdf, Bosch_Releaseletter_CPP4_H.264_FW_5.60.0063.pdf)
==> There are many local download sites. I recommend to use this one: http://de.boschsecurity.com/ (click on “Products ==> Video).
Select the device you are interested in. There are always several tabs for each IP device (camera, encoder, …), for instance: Details, Certificates, Documents, Software Downloads. Choose Tab “Software Downloads”. There you find all the things you asked for in one place, usually the “CPP Firmware” and the “Bosch Video Client” (zipped).
The “Configuration Manager” and MPEGActiveX are included with the “Video Client” ZIP file. The ZIP files include the release letters too. More documents can be found selecting the “Documents” tab.
For instance browse to Dinion HD 1080p HDR: http://de.boschsecurity.com/master_product/02_products_1/st_bu_f_277305_nsode_catalog_prod_de/st_section_f_276651_nsode_catalog_prod_de/st_prodfam_p_276651_nsode_catalog_prod_de_277049