Per this document, Quad-Sup is now supported in the Catalyst 4500. https://www.cisco.com/c/en/us/support/docs/switches/catalyst-4500-series-switches/118597-config-vss-00.html
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ipsec tunnel throughput still limited to only 85Mbps unless additional FL-4330-HSEC-K9 license is purchased?
Yes, security and performance license are two different things.
or does it also increase to 300Mbps?
No
If hsec is required, is it necessary to have both SEC and FL-4330-HSEC-K9 licenses purchased to use all ipsec/vpn features?
Yes, SEC license is a prerequisite for HSEC
or would just the the FL-4330-HSEC-K9 alone take care of this?
No
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Finally Cisco added support for front-back airflow for the 5596T on the NX-OS Release 6.02 http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/release/notes/6_02/Nexus5500_Release_Notes_6_02.html Cisco Nexus 1100 W AC front-to-back power supply (PID: NXA-PAC-1100W) Cisco Nexus 5596UP/5596T Fan Module, front-to-back Airflow (PID: N5596UP-FAN) NX-OS Release 6.02
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