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The Scalable Feature License is the new Nexus 7000 system license that enables the incremental table sizes supported on the M-Series L Modules. Without the license, the system will run in standard mode, meaning none of the larger table sizes will be accessible. Having non-XL and XL modules in a system is supported, but for the system to run in XL mode all modules need to be XL capable, and the Scalable Feature license needs to be installed. Mixing modules is supported, with the system running in the non-XL mode. If the modules are in the same system, the entire system falls back to the common smallest value. If the XL and non-XL are isolated using VDCs, then each VDC is considered a separate system and can be run in different modes.
In order to confirm whether the Nexus 7000 has the XL option enabled, you first need to check if the Scalable Feature License is installed. Also, having non-XL and XL modules in a system is supported, but in order for the system to run in XL mode, all modules need to be XL capable.