No, you will need to purchase a new Ext JS 4.0 license.
You can renew your support for your Ext JS license now (which will be backdated to the expiry date), and you will obtain the rights to Ext JS 4.0 during the term of your support subscription. To renew your support subscription, email email@example.com for a quote.
Sencha publishes the road map for all of our frameworks under each respective products’ “Road Map” tab. To learn more about our current Ext JS Road Map, visit Sencha's Ext JS Road Map page.
To learn more about our release and support plans, please see Sencha's Ext JS Release Strategy page.
Yes. Within 90 days of the purchase of your Ext JS 4.0 license(s), you may purchase a support subscription. If you purchase a support subscription after 90 days of the original license purchase, your support subscription will be backdated to the date of the Ext JS 4.0 license purchase.