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Query spec version roadmap for some 5G and LTE protocols

I want to investigate the 3GPP specification versions in current wireshark 2.6.4 for some 5G and LTE protocols, and the roadmap for a newer spec version, for example 2018-Sep.

I checked the wireshark 2.6.4 codes and summarized the current supported versions as below. If any inaccuracy, please correct me.

Protocol Name   3GPP Specs      Wireshark 2.6.4 on 2018-Oct-11
F1AP            TS 38.473       R15 V15.0.0 (2017-12)
5G PDCP         TS 38.323       Not Available
5G RRC          TS 38.331       R15 V15.0.0 (2017-12)
5G NAS          TS 24.501       Draft v0.4.0 (2018-02)
S1AP            TS 36.413       R15 V15.0.0 (2017-12)
LTE_NAS         TS 24.301       R15 V15.2.0 (2018-03)
LTE_RRC         TS 36.331       R15 V15.0.1 (2017-12)
X2AP            TS 36.423       R15 V15.0.0 (2017-12)
GTPv2           TS 29.274       R15 V15.2.0 (2017-12)
Diameter        TS 29.272       R15 V15.2.0 (2017-12)

Do you have any ideas or clues for wireshark roadmap for the newer versions? For example, when will wireshark support the 2018-09 version specs for above protocols?