SpaceX's recently updated launch manifest no longer lists Astrium flying on Falcon 1E. Astrium simultaneously switched to European and Russian rockets after it signed several agreements earlier this year and last year (mostly on grounds of Falcon 1's extremely low mission success rate).
On a related note:
the second of two production batches of Merlin 1C Engines originally set aside for its Falcon 1/1E program have been transferred for future use on Falcon 9.
If a customer wants to fly on 1/1E it can be expected to be powered by 1D engines or newer block engine versions.
The Falcon 1/1E's latest order to launch build timelines closely match that of ULAs Delta II.
So essentially the Falcon 1 family is semi-permanently sidelined at this point until Russia stops flying payloads on converted ICBMs, Vega becomes to expensive for most customers, and alternatives diminish in supply. This not enough interest in the rocket to continue the program. Falcon 1E is no longer displayed on the Falcon 1 page as of today.
This was just added to their site today:
SPACEX LAUNCH AND PLACEMENT SERVICES
FALCON 1 PAYLOADS
Current plans are for payloads that would have previously flown on Falcon 1 (SIC 1e) to be served by flights on Falcon 9, utilizing excess capacity. This is a very cost-effective solution for small satellite launch needs. For more information on Falcon 9 capabilities, see the Falcon 9 overview.
For further information, contact us at email@example.com.