What's the segwit transaction serialization "flag" field for?

What's the segwit transaction serialization "flag" field for?

According to bip 141, the segwit transaction serialization format (used to compute the wtxid) is:

[nVersion][marker][flag][txins][txouts][witness][nLockTime]

The bip mentions that the flag field MUST currently be 0x01. What's the purpose of this field? Is it some kind of upgrading mechanism of the serialization format?

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